
.return-top{
    width:50px;
    height:50px;
    font:bold 20px/40px "微软雅黑";
    color:#fff;
    background-color:#d1cccc;
    position:fixed;
    bottom:20px;
    right:20px;
    text-align:center;
    cursor:pointer;
    display:none;
    border-radius:6px;
   
}
.return-top.active{
    display:block;
}